https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61582 --- Comment #10 from Maksymilian Arciemowicz <max at cert dot cx> --- There is also one other alternative like this http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/regex/regcomp.c.diff?r1=1.29&r2=1.30&f=h